Portion of a display panel with a topic icon



FIG. 1 is a front view of a portion of a display panel with a topic icon showing features of my new design.

The broken lines including the showing of a portion of a display panel of a communications terminal surrounding the illustrated computer icon are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a display panel with a topic icon, as shown and described. 